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Vehicle control device and vehicle control method

a technology of vehicle control and control device, which is applied in the direction of electric control, machines/engines, transportation and packaging, etc., can solve the problems of insufficient marginal torque, inability to increase actual engine torque to the target engine torque, and small actual drive force, so as to reduce the shortage of drive force and improve the effect of driving

Active Publication Date: 2016-08-02
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention aims to address the problem of a shortage of engine power when trying to reduce the target engine speed by upshifting. The invention helps to improve the quality of driving and prevent the issue of drive force reduction.

Problems solved by technology

However, there are cases where a marginal torque is insufficient and an actual engine torque cannot be increased to the target engine torque even if it is actually attempted to increase the engine torque.
This causes a problem that the actual drive force becomes smaller than the target drive force and drivability is deteriorated.

Method used

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  • Vehicle control device and vehicle control method
  • Vehicle control device and vehicle control method
  • Vehicle control device and vehicle control method

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Embodiment Construction

[0012]Hereinafter, an embodiment of the present invention is described with reference to the accompanying drawings.

[0013]With reference to FIG. 1, an output of an internal combustion engine 1 of a vehicle is input to a continuously variable transmission 12 via a torque converter 11. The continuously variable transmission 12 includes a primary pulley 13, a secondary pulley 14 and a V-belt 15 mounted on these. The primary pulley 13 changes a radius of contact with the V-belt 15 by changing a groove width according to a hydraulic pressure Ppri. The secondary pulley 14 changes a radius of contact with the V-belt 15 by changing a groove width according to a hydraulic pressure Psec. As a result, the continuously variable transmission 12 continuously changes a ratio of an input rotation speed and an output rotation speed, i.e. a speed ratio according to controls of the hydraulic pressures Ppri and Psec. The hydraulic pressures Ppri and Psec are generated by a hydraulic pressure supply devi...

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PUM

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Abstract

A vehicle control device includes a target drive force setting unit configured to set a target drive force based on an operating state, a target speed ratio setting unit configured to set a target speed ratio of a continuously variable transmission to achieve the target drive force and a target torque setting unit configured to set a target torque of a drive source to achieve the target drive force. The target drive force setting unit is configured to set a target drive force reduced in a stepwise manner at the time of upshifting in the continuously variable transmission.

Description

TECHNICAL FIELD[0001]The prevent invention relates to a vehicle control device and a vehicle control method.BACKGROUND ART[0002]Conventionally, a control device for changing a speed ratio of a continuously variable transmission in a stepwise manner to increase a vehicle speed while repeating a gradual increase and a sudden decrease of an engine rotation speed when a vehicle is determined to be in a sudden acceleration requesting state according to an operated amount of an accelerator pedal is disclosed in JP5-332426A.SUMMARY OF INVENTION[0003]Using the above invention, it is considered to control a continuously variable transmission by setting a target drive force according to an operating state of a vehicle and setting a target engine rotation speed and a target engine torque based on the target drive force. In the vehicle including this continuously variable transmission, a speed ratio of the continuously variable transmission is controlled to achieve a target input rotation speed...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): F16H61/662B60W30/19F02D45/00B60W30/188F02D41/14F02D41/02B60W10/107F02D41/10B60W10/06F02D29/00
CPCF02D41/023F02D41/10F02D41/1497B60W10/06B60W10/107B60W30/1882B60W30/19F02D45/00F02D41/0225F16H61/66259F16H61/66272B60W50/06F02D29/00F02D2250/18F02D2400/12B60W2510/106B60W2510/1005B60W2710/0666B60W2510/105F02D2200/101F02D2200/501F02D2250/21B60W2050/0042B60W2520/10B60W2540/10
Inventor ONO, MASASHIYOSHINO, TAKAHIROIRIYAMA, MASAHIRO
Owner NISSAN MOTOR CO LTD